A certain inverting amplifier has a closed-loop voltage gain of 25. The Op-amp has an open-loop voltage gain of 100,000. If an Op-amp with an open-loop voltage gain of 200,000 is substituted in the arrangement, the closed-loop gain ..

doubles

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drops to 12.5

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remains at 25

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increases slightly

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Solution

The correct option is C remains at 25
the closed loop gain is given by $A_{c l} = \frac{A}{1 + A β}$ . since the open loop gain is large, the closed loop gain almost remains a constant, as it will be independent of open loop gain

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An amplifier has open loop gain of A_{O L} = 5 \times 10^{3} . The amplifier is connected by the negative feedback with feedback factor β = 0.01 . If the open loop gain of op-amp decreases by 10% then the closed loop gain decreased by_____%.

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